Electrostatic electron cyclotron instabilities near the upper hybrid layer due to electron ring distributions

Eliasson, Bengt; Speirs, D. C.; Daldorff, L. K. S.

doi:10.1088/0741-3335/58/9/095002

Cited by 10 publications

(1 citation statement)

References 47 publications

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“…The interaction of charged particles with plasma is employed in many experiments as a source of supplementary heating [1,2], accelerators [3,4], discharge [5] and waves generation [6,7]. In addition to applications, due to the pervasive presence of phenomena including beam-plasma interaction, the interaction between the streaming charged particles with a magnetized plasma has been an interested subject by researchers over the last few decades, especiallyin linear [8][9][10][11][12][13][14][15] and non-linear [16][17][18][19][20][21][22][23][24][25][26][27] theory. The fastest growing modes can be characterized by the linear theory.…”

Section: Introductionmentioning

confidence: 99%

Quasilinear dynamics of ordinary mode electromagnetic cyclotron instability driven by the interaction of rotating electron beam with magnetized plasma

Rostami¹,

Khorashadizadeh²,

Niknam³

2020

Plasma Phys. Control. Fusion

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The quasilinear theory is employed to study the temporal evolution of the cyclotron instability near the ordinary mode in a magnetized plasma in the presence of the rotating electron beam. The positive gradient region of the initial distribution function is eroded by the diffusion process driven by the wave fields. It is found that the wave non-linear effects modify the electron distribution function by transferring resonance particles to the valley between the plasma bulk and the bump on tail. This movement ultimately leads to flattening the distribution function in the interaction region, which is a saturation state.

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Section: Introductionmentioning

confidence: 99%

Quasilinear dynamics of ordinary mode electromagnetic cyclotron instability driven by the interaction of rotating electron beam with magnetized plasma

Rostami¹,

Khorashadizadeh²,

Niknam³

2020

Plasma Phys. Control. Fusion

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Analytic non-Maxwellian electron velocity distribution function in a Hall discharge plasma

Shagayda¹,

Tarasov²

2017

Physics of Plasmas

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The electron velocity distribution function in the low-pressure discharges with the crossed electric and magnetic fields, which occur in magnetrons, plasma accelerators, and Hall thrusters with a closed electron drift, is not Maxwellian. A deviation from equilibrium is caused by a large electron mean free path relative to the Larmor radius and the size of the discharge channel. In this study, we derived in the relaxation approximation the analytical expression of the electron velocity distribution function in a weakly ionized Lorentz plasma with the crossed electric and magnetic fields in the presence of the electron density and temperature gradients in the direction of the electric field. The solution was obtained in the stationary approximation far from boundary surfaces, when diffusion and mobility are determined by the classical effective collision frequency of electrons with ions and atoms. The moments of the distribution function including the average velocity, the stress tensor, and the heat flux were calculated and compared with the classical hydrodynamic expressions. It was shown that a kinetic correction to the drift velocity stems from a contribution of the off-diagonal component of the stress tensor. This correction becomes essential if the drift velocity in the crossed electric and magnetic fields would be comparable to the thermal velocity of electrons. The electron temperature has three different components at a nonzero effective collision frequency and two different components in the limit when the collision frequency tends to zero. It is shown that, in the presence of ionization collisions, the components of the heat flux have additives that are not related to the temperature gradient, and arise because of the electron drift.

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Particle simulation of electromagnetic emissions from electrostatic instability driven by an electron ring beam on the density gradient

2018

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This paper presents the wave mode conversion between electrostatic and electromagnetic waves on the plasma density gradient. We use 2-D electromagnetic code KEMPO2 implemented with the generation of density gradient to simulate such a conversion process. In the dense region, we use ring beam instability to generate electron Bernstein waves and we study the temporal evolution of wave spectra, velocity distributions, Poynting flux, and electric and magnetic energies to observe the wave mode conversion. Such a conversion process can be a source of electromagnetic emissions which are routinely measured by spacecraft on the plasmapause density gradient.

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Electrostatic electron cyclotron instabilities near the upper hybrid layer due to electron ring distributions

Cited by 10 publications

References 47 publications

Quasilinear dynamics of ordinary mode electromagnetic cyclotron instability driven by the interaction of rotating electron beam with magnetized plasma

Quasilinear dynamics of ordinary mode electromagnetic cyclotron instability driven by the interaction of rotating electron beam with magnetized plasma

Analytic non-Maxwellian electron velocity distribution function in a Hall discharge plasma

Particle simulation of electromagnetic emissions from electrostatic instability driven by an electron ring beam on the density gradient

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